They are made out of wood.
This is not a joke, the weather tracks are not made in the wood factory: it is wood.
How do they work?
As soon as the day starts, a thin layer of mist is left over in front of the camera. When that layer gets bigger the clouds come closer and more quickly. At this point the cloud is no longer in the center of the frame, but very close towards the edge. It spreads at the fastest rate into a cloud. It spreads and spreads, until this cloud is bigger than the frame. It then rises rapidly and turns the frame into a blue cloud. This is the final stage of the cloud.
That’s it. It is all up to you: you can build as many weather tracks as you want.
One of the most fascinating discoveries this summer will be a tiny space rock named PDS 1140. The rock will be named after the Italian astronomer who discovered it more than 50 years ago. The spacecraft will go to work on July 1, following in the wake of an array of other asteroids around the same size. PDS 1140 will also go toe-to-toe with another asteroid of similar shape, known as 2017 HO6.
PDS 1140 will be the first asteroid ever named in honor of a person or scientist. When the name “PDS” is pronounced “Pee-dee-duh” (to a young person, it sounds a little like “Pee-pee”) it’s the name of the child born to a woman named Annabelle PDS after Annabelle Prentice de Villiers. Prentice de Villiers was also a woman of great ability who discovered the nebula M83 — and died shortly after that finding.
PDS 1140 is a gas giant and about a tenth the mass of Jupiter. Its orbits include the orbits of Pluto and Charon, two celestial bodies in the outer solar system that make up the Kuiper Belt (the belt of icy objects between Mars and the sun).
PDS 1140 was discovered in the 1970s, but only identified as small asteroids in 1994. In 2011, the Hubble Space Telescope provided a detailed look at PDS1140. That spacecraft also returned evidence that PDS 1140 may orbit the sun. If confirmed, it would be the fifth asteroid to do so. Astronomers are eager to learn more about PDS 1140’s orbit, which could tell us
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